Figure 4.

Stability of unirradiated and irradiated bacterial cultures. (A) Stability of unirradiated A. baumannii at 4 °C. P1, P2, B1, B2, and B3 cultures were prepared with or without the MDP complex and stored at 4 °C for up to 16 weeks at concentrations between 10¹⁰ and 10¹¹ CFU/mL. A portion of each sample was removed for colony counting by plating serial dilutions on agar plates at the indicated time points. (B) Stability of irradiated A. baumannii at 4 °C. P1, P2, B1, B2, and B3 cultures were prepared with or without the MDP complex, exposed to 10 kGy gamma irradiation, and stored at 4 °C for up to 16 weeks at concentrations between 10¹⁰ and 10¹¹ CFU/mL. A portion of each sample was removed and serially diluted for microscopic examination. The concentration of intact cells/mL are reported at the indicated time points.